Joseph b



(NoModeL) I J. .B. WOOD.

KNIFE FOR WOOD WORKING MACHINERY. No. 350,520. Patented Oct. 12. 1886.

Ill

UNITED STATES PATENT OFFICE.

JOSEPH B. WOOD, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-THIRDS TO CHARLESw. TREMAIN AND WILLIAM B. eoUsE, BOTH OF-SAME PLACE.

KNIFE FORVWOOD-WORKINGIMACHINERY.

SPECIFICATION forming part of Letters Patent'No. 350,520, dated October12 1886.

7 Application filed March 16, 1886.

To all whom it may concern:

. Bev it known that I, JOSEPH B. Woon, a citizen of the United States ofAmerica, residing atOhicago, in the county of Cook and State of.Illinois, have invented certain new and useful Improvements in Knivesfor VVood-Working Machinery,.of which the following is a specification,reference being had therein to the accompanying drawings. 7

This my invention has for its object to provide a knife or cutter forplaning and shaping machines, and for other wood-working machinery withcutting-edges, that by the peculiar shape will break the chips orshavings I 1 as they are cut from the wood to becomeshort,

thereby relieving the knife more readily, and

that at the same time has increased strength and durability in itscutting-edges.

For that purpose my invention consists in filing or grinding with asmall emery-wheel or otherwise forming along the edge of the knife thatis opposite to the basil a rounded groove or concave ohamfer that willtransfer the cutting-edge from the straight or permanent face aboutone-third of the thickness of the knife-plate toward the opposite orbasiled side of the knife, all as will be hereinafter more fullydescribed and specifically claimed.

In the accompanying drawings, Figure 1 o representsa section of theknife on an enlarged that will readily as set forth. scale; Fig. 2, across-section of a cutter-head Serial No. 195,425. (No model.)

A denotes the knife-plate, of flat steel, and a the basil, which, asusuah-forms an obtuse angle with the back ofthe knife, and which isground down for sharpening the cuttingedge; and b is a rounded groove orconcave chamfer filed or ground or otherwise cut in the edge of thestraight face of the knife, which groove, as will 'be noticed, changesthe position of the working or cutting edge of such knife, and moves itsomewhat toward the back of the same. By this groove b the cutting-edgeis braced and re-enforced against breaking out, by being much strongerand more durable, without thereby reducing the cutting qualities of thesame, and a chip or shaving being cut away must follow the curve ofgroove 1), and thereby will break into short fragments clear the knives,and are therefore less liable to interfere with the 'operation.

I am aware that knives of the character described have been providedwith an auxiliary strip grooved substantially as on mine, and thereforeI disclaim such a construction; but

What I claim is As anew article of manufacture, a woodworking knifehaving formed in its blade a rounded grooveorconcaved cham fer, the samebeing situated on the side opposite the basil,

In testimony whereof I affix my signature in presence of two Witnesses.

JOSEPH B. WOOD. Witnesses:

ANTON SoHoENINGER, HARRIS W. 'HUEIIL.

